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I was wondering what is the effect of sending continuos SIP registrations in the smartphones battery duration, to compare that solution (SIP register and proxy) with an Apple Push Notification alternative.

From my point of view, SIP registrations should be very expensive specially in NAT environments where typical SIP REGISTER expiration time is in the 30secs-2mins range to avoid expiration of mappings in the routers handling the NAT.

I did a quick test with a new iPhone 4 (without any background application) and the battery level at 100%.